Improved method of altering the calibre of musket and other gun-barrels



@eine tetes getint ffice'.

CHARLES E. BAILEY, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR TO ALLEN PATENT FIRE-ARMS MANUFACTURING COMPANY, OF NEW YORK CITY.

Letters Patent No. 72,777, dated December 31, 1867.

IMPEOVED METHOD OP ALTERING THE CALIBRE OF MUSKEI AND OTHER4 GUN-BARRELS.

To ALL WHoM rr MAY ooNcERN:

. Be it known that I', CHARLES E. BAILEY, of Springfield, Hampden county, Commonwealth of Massachusetts, have invented a new, useful, andimproved Method of Fitting und Securing a Steel Tube in Gun-Barrels; and I do hereby declare that the following is va full and exact description thereof, reference being hud to the accompanying drawings, and to the letters ofreference marked thereon. In the drawings- Figure 1 is a longitudinal section-of c. gun-barre1, having an internal tube fitted und secured therein in accordance with my invention.

Figure 2 is an end viewoi the saine, and Figure' 8 a sectional cross-cut through the barrel and tube. This invention consists in inserting any inner tube in a seat formed for it in'a gun-barrel, 'and fastening it there securely, this tube being afterwards .bored or riiied to the desired calibre. l

The manner of' inserting this tube is as follows: The barrel of, the gun is iirst turned out so as to have a slight taper from breech to muzzle, removing, in the operation of so turning it out, the lands it" it be a ritied barrel.

formed for it inthe barrel I3. ,Y

In order to fasten this tube inplace securelyit is brazed in at themuzzle, and between the breech' and muzzle at other points, as lmuy be necessary, the brass being melted in the imperceptible space between'thc outside surface of the inner tube and the sea-tlformedfin the barrel by heating the barrel findv tube together, after the latter has been tted in place. Inforder -to bruze the tube in at intermediate points between the In the drawings, A is a'tube, formed with a tapered exteriorsurface, and corresponding with the seatv muzzle nndbreech, it isnecessury to introdpcc the brass through aslot cut into the outside shell or barrel, and

when the latter and inside 'tube are heated together, thobrass permeates as it'is. melted ih the space between the two. In iigs. 1 und S'this slot, a, is shown as filled with brass, 'which is kept in it to fill lit up after th'c process of brazmg. c

Simply brazing a straight tube of uniform exteriorl diameter into th'o barrel bored to receive it, is not suilicient for the purpose of this invention, as in this case, from the action of the ball upon` the spiral grooves of the inserted tube, it (the tube) becomes twisted, and somecases may be blown or forcedout of the gun by the force of the charge when a largeball is passing through the tube. The twistingfhowevor slight, injures the effect of the rifle, and can be seen in guns'which have been constructed in thismanner, the raysof light through the interior of the tubefhaving avwavy appearance cnused by thehnevenness of the bore after hn-ving been twisted. It is necessary, therefore, that the inside tube should bc'formcd tapered, as 1already described, and

brazed in the tapered seat formed for it in the barrel, this preventing the bnllfrom driving it forward and twisting it, or from doing either.. 4

By this means also the diameter of the new calibre formed in the inserted., tube may be regulated to the established principle of proportionv between the length of barrels and theircalibre, in orderto give the greatest amount of propulsion to the quantity of powder used for the weight of ball; and thus a new barrel' is formedr as perfect as a solid one, and enabling a great manly arms to berestored to the proper calibre for metallic caw -tridges, which would 'otherwise be useless.

Having described my invention, what I'cluim as new, and desire to secure by Letters Patent, is-

The insertion of an inside tapered tube, A, in a seat formed for it by boring outthe barrel 4B of u'gunor rifle in such a. manner that it tapers inside from breech to muzzle, and corresponds withthe outside tapered surface of the tube A, and iirmly securing the lutter in place by brnzing at the muzzle andl other` parts, substantially as and for the purpose described.

CHAS. E. BAILEY.

Witnesses:

R. F. HYDE, Enw'nmp H. HYDE. 

